Process for manufacturing a mortar-forming material from anhydrite



P ts- M 2 Q} j a teififii FRITZ HARTNER, OFA'IVHOMBIVJI'I-RG, GERMA IY- ruooss's For rgeuoreorueme A iuo a-reaeromirrieMATERIA rieom e iiifiznarrzgj No Drawing. Applicatioxi filed' November 12I, .192 0.Y Seria1 423,762.

.To all whom it may concern; I 'hardeningpower when ground soasto have" w Be it known that I, 'FRITZ HARTNER, sugreatest possible amount O f -fiRG" powder, perin tendent a subject of theGerrnan State, passing through 10,000 mesh per sq'. one; V residing at rHomburg: d. .Hohe, State .lof sieve i. e. -1powder below 0,006 inm..in size. 5 Pi'ussia-, Germany, have-invented certain For puttingin practice this kind oft-he new and useful Improvements in Processes new process, anhydrite or the anhydrite I r- 1 for Manufacturing a Mortar-Forming -Ma I bearing rock has to be powdered with such terial froni Anhydritegofwhich thefollowgrinding apparatus that the proper portion 4 ing is a'specification; I V of finefpowder or. in more precise terms'the 1O flHitherto anhydrite could not be turned impalpable dust like powder isa's great as into a mortar-forming material having suitpossible. Either suchgrindingmechanisms able self-setting properties." Only recently, as,'e' ball-and tube-mills, are to be see I means have been proposed directly allowingj 'l'ected which immediately provide the re I the use ofanhydrite'for mortar-preparation, quired degrees of impalpability in a sufli-' 5 with or without the addition of other in-- "ciently extended period ofgrinding or else gredicnts. Now Thaye been successful innthe' grinding contrivances areptoibe so Cl'e-' obtaining a mortar-formin -agent by the ised or to be so conducted that'principally mere use of anhydrite, with no other means a fine powder is obtained. for attainiiig the settingpropertiesi P For the purpose are recommended by prefquite surprisiugvsolution of the problemerence the mills operating with balls as pul consistsin grinding theanhydrite as fine'as f'verizing media, such as pebbles or steel-balls.

it possibly be rdone-o Vfhen it is pulyerg {As an example of such InillsfE may mention I ized in suitable grinding apparatus to its inaddition to the ballor drum-mills proper; i'fullest extent, it sets without any further tube-mills comp'oundmills',horizontal ball 25.2(l1iliiiQ11S and without any'further treats mills. The required impalpabilityci.,e.:-thez inent, having the hardening power of an; prevailing ofthe finest, powder in the dust etiicien't ruortar-forming inaterial; like product is obtained the [more reliably The speedof settings will be allthe quicker as the grinding surface is longer. I a and the figures of resistance will be t-he I claim: II V I 1 a I be more favourable, the moreimpalpable the 1. self-setting anhyIdrite mortar form-j aulrerization. I 7 ing material ore fineness passing through The essential feature of the'invention is a screen or" 900meshper square cm; V, thusthe ascertaining that anhydritqnot ca 3 2. -A self-setting anhydrite mortar -mate- 7; pahle of-setting otitse'lfl or sulphate of calrial the major portion of the particles of L5 cium in a similar state or anhydrite bearing which will pass through a screen of 10,000

rock may be converted intoa'InOrtar-fOrmT Ineshper sq.cm. I I. v, .1 v

' iug material if the grinding'process is. Intes'timony whereot Iaflix my signature pushedto a sufficient degreef I in presenceof two witnesses. V, 5 0

Trials have evincedthatanhydrite,resulti s y FRITZ HARTNER i to ing'in a residue of from 20 to 30% on the' lwitnesses'z: 'I r 1 f 900 meshes sieve, isflstill fully inert, but "WI LTHARTNER. shows thorough setting and satisfactory JOHANNA HARTNER. 

